Sewing-machine



F. CROZET.

SEWING MACHINE.

APPLICATION man Dec. 29, 1917.

Patented July 5, 1921.

2 SHEETS-SHEET l.

F. CROZET.

SEWING MACHINE.

APPL|cAT|oN` man Dc.29. 191.1. I

1,383,604, Patented July 5, 1921.

2 SHEETS-SHEET `2 m22 www UNITED am,

N, r a

sEWIive-MACHILTE.y

Specification ofrLettersPatent.

patented July 5, 1921.

Application filed December 29, 1917. VSerial No. 209,473.

To all 'whom it may concern:

Be it known that I, FRANgoIs Cnoznr, a citizen of the Republic of F rance,.and resident of Condrieu, Rhone, France, have invented new and useful Improvements in Sewing-Machines, which improvements are fully set forth in the following speciication.

This invention relates to sewing machines, and it proposes certain improvements hereinafter fully described.

Sewing machines of the oscillating needle type, which are used at present, for embroidering and festooning, for making zigzag stitches, for buttonhole making, and for openwork and the like, have not proven entirely satisfactory, and their output is comparatively small. In a machineffo'r making zig-zag stitches, for example, hereinafter termed for convenience a zig-.zag machine, two needle strokes and two stitches are required in order to enable the needle to pass from one side of the zig-zag to the other. Machines with two oscillating needles have been built, it is true; but the needles of these machines which can work 'side by side merely give two zig-zag stitches side by side;

or if they can cross one before the other for the purpose of making va double zig-zag stitch consisting of two zig-zag stitches, one upon the other or one at ythe -side of the other, then the points where4 the needles reach the plane of the work plate are in two different lines one of which lies behind the other with respect to the line of feed, the

-loops of both needles cannot be caught by the same shuttle and the stitchlisjnot regular. l f

The object of the present invention is to provide a machine comprising tw'o oscillating needles which can cross one before the other and the oscillation of which can be adjusted, these needles being so mounted and operatedpas to always pierce the fabric at two points on a lineinthe work plate normal to the feed line, so that the loops of both can' be caught by the same shuttle andthe stitch will be' regular. 4

In the accompanying drawing:

Figures l, 2 and 3 are front, side and plan v Figs. 5 land 6 are front and side views, respectively, of a form of needle carrier whichy permits the needles to cross each other at the upper end of their stroke, and Fig. 7

the axis of oscillation can be horizontal, vertical or inclined, and one of the needles may be disposed perpendicular to thefabric, provided that the paths in which the needles move are inclined relatively to each other so that the needles maybe able to oscillate and to cross each other and still stitch on the same line on the work plate.` n

Referring to Figsf l, 2 and 3, 85 indicate the driving shaft which is journaled in and extends through thergooseneck in the ordinary way and which is provided at its projecting rear end with the usual' fly wheel and driving pulley (not shown); the said drive shaftbeing connected to actuate the shuttle mechanism through'the intermediary of' suitable gearing. Y

-The saidldrive shaft carries at itsV front end a 4crank disk 88 having a pin 88 fixed to it, whichfpin is connected by a pitman 89 to a pin or stud 89 carried by a sleeve 892 fixed to a false needle holder 36. rllhe latter is disposed vertically,as shown in Fig. l, and is mounted to reciprocate in a guide frame or bracket 43 carrying' a Xedpin 42,

1 about whichl the two inclined needle holders 40. oscillate. These' holdersV fit in tubular guide vv:sleeves 41 that are provided at their upper ends with arms or vextensions 44 ter* minatingin eyes 45 through which pin 42 passes. rI`he needle holders project upwardlyV beyond the guide tubes and have short connecting rods or cranks 39 attached to them which are suspended from a lateral pinv38 vfixed by means of a sleeve 37 to the false holder 36; the arrangement being such, therefore, that the reciprocation of the said false holder 36,'produced as above described bymeans of theV driveshaft 85, disk l88, pitman 89 and pin 89', will cause the two needle holders to reciprocate, as will be understood, the two cranks 39 moving in unison with the falseholder 36. The guide tubes 41 are fitted at their lower ends with rectangular preferred manner.

Ysli

blocks 46, 47 (Fig. 3) which are disposed within a fork 49, 50, fixed to the frame 43 and closed or bridged by a plate 52 (Fig. 3) fastened to the fork arms by screws 48, 51. Each block 46 or 47 is actuated by a pin 53 or 54 (Fig. 2), both pins being mounted on a single crank arm55 which, in turn, is secured to a horizontal shaft 56 and is oscillated thereby. f

' The mechanism above describedl for operating the oscillating needles, is especially applicable to sewing machines, festooning machines, zig-Zag machines, etc. Figs. 5, 6 and 7 relate to the application of oscillating needles capable of crossing each other to an embroidering machine; and in such machines the'needle holders are disposed within a tube which is designed to rotate about its axis, so that unless the tube be of unusual dimensions the inclined arrangement.of the needles cannot be applied thereto. It is extremely important that the movement of lthese needle holders as a whole shall be substantially vertical, while still permitting the needles to cross each other and to oscillate inversely; and with that end in view, the following arrangement may be adopted.

The two needle holders L and M are pivoted to a single ball A mounted in a suitable bearing 'to which the desired vertical reciprocatory movement is imparted in any The holders L and M, which are of the so-called dog-leg type, extend through openings B and N formed in a the desired oscillations of the holders by moving inversely in-an arcuate path, the center of which is the center of movement of ball A. If the parts of the holders which slide in the openings B and N are slightly inclined to each other, instead of parallel, so as to cross each other on the same side of the fabric with respect to the said guide open.- ings B and N, the needles in rising will move apart in order to enable them to cross each other; and this inclination 0r curvature may be so calculated that the movements of the needles away from each other may take place at any desired point of the stroke. If all calculations have been correctly made, it will then .be possible to arrange that each needle shall move in a path which is very close to the plane passing through they point G of the fabric (Fig. 5) and havingl a glitly greater inclination than the lines BC and NC. Fig. 5 shows the needle holders at the lower lend of their stroke with one needle inthe fabric. Should the other needle be shown, one needle would 'cover the lower part 0f the other. WVhen the holders rise, they are caused to diverge, together with the needles which they carry, owing to the inclination of the guideportions BC and NC, so that at the upper end of the stroke (Fig. 7) vthe needles are enabled to cross pair of guides F and K which produce I each other while oscillating in planesl which the other needle, thus producing a lacingin the form of a lozenge, and that the shuttle thread V74 at the back of the fabric returns at eacli stitch to the same side of the lacing, so that both on the back and on the front of the fabric the thread laid is double that of an ordinary machine with a single oscillating needle. It is, in fact, a double Zig-zag stitch constituted by two zig-zag stitches, one .over the other, fixed by a single shuttle thread.

I claim-w 1 l. In a sewing machine,the combination with a pair of vertically-arranged needle holders mounted for both oscillatory and vertically reciprocatory movements with re.-Y

lation to the work plate for the fabric, andk needles carried thereby, of separate means for imparting they oscillatory and reciproca` tory movements to the needle holders, and means for moving the needles along paths inclined relatively to each other so as to move and to pierce the fabric alternately at the Y.

samepoints in the plane of said plate.

2. In a sewingmachine, the combination with a pair of needle holders mounted for both oscillatory and axially reciprocatory movements with relation to the work plate for the fabric, and needles carried thereby, of means for reciprocating. the `needle, holders, means for oscillating Vsaid holders, and means for moving the needles along paths inclined relatively to each other; Vwhereby both needles are caused to always reach the plane of the work plate at two points which are in a line that is normal to the line of feed of the fabric, and toY pierceY the fabric alternately at the same points in the plane of said plate. Y

3. In a sewing machine,`the combination with a pair of verticallyfarranged needle holders mounted for both oscillatory and vertically reciprocatory movements with relation to the work plate for the fabric, and needles carried thereby, ofseparate means for imparting the oscillatory'and reciprocatory movements to the vneedle holders, and a pair of guides inclined relatively to each other and through whichsaid holders move, said guides causing the needles, in rising, to move away from each other whereby they may cross eachother at the top of their up- In vtestimony whereof I have signed this ward stroke; whereby both needles are specification in the presence of twol subcaused to always reach the plane of the work scribing witnesses.

plate at two points which are in a line that is F RAN QOIS CROZET. 5 normal to the line of feed of the fabric, and Witnesses: v

t0' pierce the fabric alternately at the same HENRY BELMONT,

points in the plane of said plate. Y JEAN CHAMPIOU. 

